A request-reply type class.

a is the request type, b is the response type.

Example:

>>> {-# LANGUAGE DataKinds #-}
>>> {-# LANGUAGE TypeApplications #-}
>>> 
>>> import Control.Concurrent.Async
>>> import Data.Binary
>>> 
>>> data A = A deriving (Binary, Show)
>>> data B = B deriving (Binary, Show)
>>> 
>>> instance RequestReply A B
>>> 
>>> reply :: A -> IO B
>>> reply _ = return B
>>> 
>>> main :: IO ()
>>> main = withAsync (responder "tcp://*:5000" reply) $ \_ ->
>>> requester "tcp://127.0.0.1:5000" A >>= print

Start responding using the given type class.

See RequestReply for an example.

Silently ignores a request when decoding fails

Request a reply.

See RequestReply for an example.

Throws an error when the response cannot be decoded.